Valve-gear.



s. ROSENZWEIG. VALVE GEAR. APPLICATION FILED MAR. 17 1911. 1,047,300, I v Patented Dec. 17, 1912.

2 SHEETSSHEET 1.

' Q Viwwowo Y 5 I 4 m Gum/m S. ROSENZWEIG.

VALVE GEAR. APPLICATION IILED MAR. 17, 1911.

Paltented Dec. l7, 1912.

2 SHEETS-SHEET 2.

nnrrnn snares rarnrvr @hhflQE SIEGFRIED ROSENZWEIG, 0F ERIE, FENNSYLVANIA.

VALVE-GEAR.

Specification of Letters Patent.

Patented Dec, '17, 1912.

Application filed; March 17,1911. Serial No. 615,0?2.

To all whom it may concern:

Be it known that I, Srnornmn ROSENZWEIG, a citizen of Germany,'residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Valve Gear; and I do hereby declare thefollowing to be a full, clear, and

exact descriptio-n'of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to theletters of'reference markedthereon, formingpa'rt of this specification.

My invention relates to valve-gear for steam engines and consists substantially in novel improvements in the construction of -valve-.gear wherein the valve is moved by means of-an oscillating. cam-lever mechanism; I r

,In the mechanism, as ordinarily constructed the cam lever is on a shaft having a;-fixed a-Xis of oscillation, and as the face of the cam-lever has a, comparatively short ,traverse against the stud on the valve-stem 25" the curves, of the camfsurface on the camlever must be solabrupt, in. order to produce the'necessary quick movement of the valve, that greatdifiicultyis encountered in making the curves of the cam surface of a shape whichwill operate on they valve-stem stud wvit-lio'ut'j-ar and noise when the mechanism is "operating at high speed. To oyercome this difliculty 1 1 mount the cam-lever 'on a shaft provided with eccentric journals rig-.

idly secured thereto, and as the cam-lever is oscillated the axis of the: shaft moves as the face of the cam-lever traverses the stud on the valve-stem, whereby I am enabled tomake the curves of the cam surface on the cam-lever so much less abrupt that the cam:

lever will operate against the stud on the valve-stein with comparativelylittle fridtion, and ,without noise or jar, and with great efficiency at whatever speed the mechanism may be operated.

The features of my invention ire hereinafter fully set forth and'eXplaincd, and illustrated in the accompanying drawings in which: p v

Figure 1, shows an end view in elevation of a puppet-valve gear embodying tiny invention. Fig. 2, shows a side view in ele-fi vation of a portion thereof embodying my invention. Fig. 3, shows the portion thereof embodying my invention partly in elewhen and partly 1n section. Fig. 4, shows a top or plan View of a portion thereof em- Fig. 7 shows, diagrammatically, the opera-'- tion of my improvement;

In these drawings illustrating my invention, A, indicates a steam engine cylinder, B, a puppet-valve, B, the valvestem, C, G, the valve-stein support and housing, D, a valve actuating eccentric geared to the engine-shaft (not shown) and D, an eccen trio rod, all of ordinary construction. vOn the valve-stem, here'is a stud a, preferably providerl a friction roller, 5, and above the v -c;s.te'i'n, B, within the part, C, of the housing, there is a spiral spring, E, operating on the valve-stem,.]3, to close the valve, B. On one side of the top of the part, C, of the valve-stem support and housing, there is provided a bearing, F, in which I mount an. eccentric, G, rigidly secured to the shaft, G so as to be rocked by said shaft,, -and on-o ne end of the shaft, G,.l secure scam-lever, H, provided with a curved surface, III, which is preferably in the form of a reverse curve from the highest point or toe, h, thereof. to the lowest point, 71 thereof, upon which cam-surface the roller, 5, on the stud, 12' on the valve-stem, B,- travels as the cam lef cnll, is oscillated, and on the oppositea f the shaft, G, I secure a lever, I, to v hich the eccentric rod, 1), is pivoted so that it operates to oscillate the shaft, G, and the cam-lever H,

secured thereto.

The operation of my improvement is illustrated in Flg. 7, wherein it is'dlagranimatically shown that when the forward move- -n1ent of the cam lever, H, starts, the axis of t the shaft, G, is at thepoint, w, while the point, if, of the cam lever, H, is in contact with the roller, 6, and as the shaft, Gr, rotates upon its eccentric journals, G, the cam surface, It, travels under the roller, 6, and gradually raises the entire camdever, H, until when the toe, h of the camsurface, 72, contacts with the roller, Z); and meanwhile the center of the shaft G, has traveled upward to the point, 00 carrying the cam-lever, H, upward and laterally until the toe, h, thereof is raised to the point, y, instead of the point, e, as would be the case if the axis of the shaft, G, was constantly maintained at the point, a, The result: of this eccentric Cir movement ofthe shaft, G, being that much less curvature of the camsurface, h, of the cam-lever, H, is necessary between the toe, 7i,

1), from its lowest point in contact with the part, if, of the cam surface, to the highest point,*y, of its traverse. The result-of this construction being that While a maximum vertical movement is given the roller, 6, there is a comparatively small and easy curvature in the cam surface, h, of the camlever, H, whereby its operation on the roller, 6, is rendered comparatively'noiseless and Without jar at whatever-speed the I11QCl1tr nism may be operated.

I have thus shown and described one type of construction of'rny improvement. It is obvious,'however,- that the invention can be utilized in various constructions of puppetvalve mechanism withoutdeparting from the .spirit of my invention.

Therefore what I claim as new and desire to secure by Letters Patent is:

1.-'Tl1e combination in an engine valvegear, of a valve-stenn'a rock-shaft rigidly mounted on an eccentric rotatable in abearmg adpcent to said valve-stem, a cam-lever and means for operating said rock-shaft,

substantially as set forth.'

' The combination in an engine valvegear of a valve-stein, wreck-shaft rigidly mounted on an eccentric rotatable in a bean .ing adjacent to said valve-stein, a canrlever rigidly secured to said rock-shaft so to engage said val\e-stcm, an operating lever rigidly secured 'on said rock-shaft and spring mechanism adapted to maintain said valve-stem in a normally downward position, substantially as and for the purpose se't forth. I

In testimony whereof I ailix my signature, in presence of two witnesses.

SlllG-FR-llill) ROSENZWETG. \Vitnesses:

G. J. MEAD, FLORENCE S'rocai'in'r. 

